Stormwater Management: Los Angeles vs Pomona
How do stormwater management rules compare between Los Angeles, CA and Pomona, CA?
Pomona has fewer restrictions than Los Angeles.
Los Angeles, CA
Los Angeles County
LAMC 64.72 (LID Ordinance, Ord. 183833) requires new development to manage stormwater runoff on-site through infiltration, bioretention, or capture systems. Priority projects must meet MS4 permit standards using the Development BMP Handbook. Projects disturbing 1+ acres need a state SWPPP. Grading permits are conditioned on stormwater compliance and a recorded covenant.
View full Los Angeles rules →Pomona, CA
Los Angeles County
Pomona enforces stormwater management under the LA County MS4 permit and NPDES requirements. Construction projects must implement BMPs. The city participates in the San Gabriel River watershed programs.
View full Pomona rules →Key Facts Comparison
| Fact | Los Angeles | Pomona |
|---|---|---|
| Code Section | LAMC 64.72 (LID Ordinance) | - |
| Requirement | On-site stormwater management | - |
| Hierarchy | Infiltration > bioretention > treatment | - |
| 1+ Acre Sites | State SWPPP required | - |
| Covenant | Recorded BMP maintenance agreement | - |
| Permit | - | LA County MS4 / NPDES |
| BMPs | - | Required for construction projects |
| Watershed | - | San Gabriel River |
| Authority | - | LA Regional Water Quality Control Board |
Highlighted rows indicate differences between cities.
Los Angeles FAQ
Do I need a stormwater plan for my project?
Generally required for new construction and major renovations that increase impervious surface area. Small residential projects may be exempt.
What is an illicit discharge?
Any non-stormwater substance entering the storm drain system, including paint, oil, chemicals, or sediment. Report violations to Los Angeles public works.
Pomona FAQ
Do I need a stormwater plan for my project?
Generally required for new construction and major renovations that increase impervious surface area. Small residential projects may be exempt.
What is an illicit discharge?
Any non-stormwater substance entering the storm drain system, including paint, oil, chemicals, or sediment. Report violations to Pomona public works.
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